Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron
文献类型：期刊论文
| 作者 | Ho, Steven Sai Hang2; Ding, Gang1; Wang, Chuan1; Xu, Zhen1,3; Wang, Xianxiang1; Zhao, Maojun1; Li, Yunchun1 |
| 刊名 | DESALINATION AND WATER TREATMENT
 |
| 出版日期 | 2016-03-02 |
| 卷号 | 57期号:11页码:5065-5078 |
| 关键词 | Chromate Kaolin Supported Nanoscale Zero-valent Iron Removal Mechanism |
| DOI | 10.1080/19443994.2014.1002430 |
| 文献子类 | Article |
| 英文摘要 | A removal mechanism of chromate (Cr) by synthesized kaolin supported nanoscale zero-valent iron (K-nZVI) from aqueous solution is demonstrated. Parameters which potentially influenced the functioning of K-nZVI have been investigated as well. Based on the scanning electron microscopy, Fourier transform infrared spectroscopes, X-ray crystal powder diffraction and X-ray photoelectron spectroscopy identifications, we confirm that amorphous Fe-0 core/FexOy shell nZVI can be successfully loaded into the pores and cracks, and onto the surface of kaolin. Removal efficiency of Cr by K-nZVI decreased with increasing initial pH and Cr(VI) concentration, but increased while K-nZVI dosage increased. Humic acid and phosphate had similar dual impacts on chromium removal by K-nZVI, and the inhibitory effect was obvious at high concentrations in spite of their different reaction mechanisms. In contrast, high concentrations of sulfate and nitrate could advance the chromium removal. Adsorption isotherms indicate that the removal processes are endothermic. The data obtained can be better explained with Langmuir than Freundlich model. At the conditions of 318K and optimized pH 4.0, the maximum adsorption capacity was 33.39mgg(-1) illustrating that K-nZVI was effective for the removal of total Cr. The removal mechanism is proposed to divide into four phases, including: (1) aqueous Cr(VI) ions are captured on the surface of K-nZVI; (2) the captured Cr(VI) are partly reduced to Cr(III) accompanied by Fe-0 oxidizing to Fe2+; (3) part of oxidized Fe2+ continues to reduce Cr(VI); and (4) produced Cr(III), Fe2+, and Fe3+ are formed passivation layers on the K-nZVI surface which prevent further removal of chromium and result in redundant Fe-0. |
| WOS关键词 | HEXAVALENT CHROMIUM ; WASTE-WATER ; ENHANCED REMOVAL ; FE-0 NANOPARTICLES ; HUMIC-ACID ; CR(VI) ; REMEDIATION ; REDUCTION ; MECHANISM ; REACTIVITY |
| WOS研究方向 | Engineering ; Water Resources |
| 语种 | 英语 |
| WOS记录号 | WOS:000368037100032 |
| 源URL | [http://ir.ieecas.cn/handle/361006/5858]  |
| 专题 | 地球环境研究所_黄土与第四纪地质国家重点实验室（2010~） |
| 作者单位 | 1.Sichuan Agr Univ, Coll Sci, Yaan 625014, Peoples R China 2.Chinese Acad Sci, Inst Earth Environm, SKLLQG, Key Lab Aerosol Sci & Technol, Xian 710061, Peoples R China 3.Zhejiang Univ, Dept Chem, Hangzhou 310027, Zhejiang, Peoples R China |
| 推荐引用方式 GB/T 7714 | Ho, Steven Sai Hang,Ding, Gang,Wang, Chuan,et al. Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron[J]. DESALINATION AND WATER TREATMENT,2016,57(11):5065-5078. |
| APA | Ho, Steven Sai Hang.,Ding, Gang.,Wang, Chuan.,Xu, Zhen.,Wang, Xianxiang.,...&Li, Yunchun.(2016).Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron.DESALINATION AND WATER TREATMENT,57(11),5065-5078. |
| MLA | Ho, Steven Sai Hang,et al."Comprehensive study on the removal of chromate from aqueous solution by synthesized kaolin supported nanoscale zero-valent iron".DESALINATION AND WATER TREATMENT 57.11(2016):5065-5078. |
入库方式： OAI收割
来源：地球环境研究所
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。